/** * InterfaceDefinition.java * * * Created: Fri May 4 23:56:14 2001 * * @author * @version */ import java.io.*; import java.text.*; import java.util.*; import javax.servlet.*; import javax.servlet.http.*; import servicefinder.ServiceFinder; import net.jini.core.lookup.ServiceItem; import java.lang.reflect.Method; public class InterfaceDefinition extends HttpServlet{ public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException { response.setContentType("text/html"); PrintWriter out = response.getWriter(); out.println(""); out.println(""); out.println("" + "Interface Definition" + ""); out.println(""); out.println(""); HttpSession session = request.getSession(); ServiceFinder finder = (ServiceFinder) session.getAttribute("ServiceFinder"); if (finder == null) { out.println("Can't find service finder - try reloading main page"); out.println(" "); return; } String interfaceName = request.getParameter("interface"); if (interfaceName == null) { out.println("No interface parameter supplied"); out.println(" "); } out.println("

Information about interface " + interfaceName + "

"); // we can't get ask for the class of the interface, since // we may not have its class definition. So we have to // look for it as an interface of one of the services, // which will involve a recursive search ServiceItem[] services = null; try { services = finder.getServices(); } catch(java.rmi.RemoteException e) { out.println("

" + e.toString() + "

"); out.println("\n"); return; } Class cls = null; for (int n = 0; n < services.length; n++) { Class service = services[n].service.getClass(); cls = getInterface(interfaceName, service); if (cls != null) { break; } } if (cls == null) { out.println("Can't find interface definition"); out.println("\n"); return; } printDefinition(out, cls); out.println(""); out.println(""); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException { doGet(request, response); } /** * This needs to be called recursively as we walk * up the tree of interface definitions */ Class getInterface(String interfaceName, Class iface) { if (iface.getName().equals(interfaceName)) { return iface; } Class[] parentInterfaces = iface.getInterfaces(); for (int n= 0; n < parentInterfaces.length; n++) { Class ret = getInterface(interfaceName, parentInterfaces[n]); if (ret != null) { return ret; } } return null; } void printDefinition(PrintWriter out, Class cls) { out.print("

\ninterface " + cls.getName());
	Class[] ifaces = cls.getInterfaces();
	if (ifaces.length > 0) {
	    out.println(" implements");
	    out.print("        " + ifaces[0].getName());
	    for (int n = 1; n < ifaces.length; n++) {
		out.print(", \n        " + ifaces[n].getName());
	    }
	}
	out.println(" {");

	Method[] methods = cls.getDeclaredMethods();
	for (int n = 0; n < methods.length; n++) {
	    printMethodDefinition(out, methods[n]);
	}
	out.println("};\n